Abstract
在電腦通訊網路的領域□，網路連結是一項非常重要的技術，對於傳統網路的連結，早已經有相當之研究，近年來，高速網路的探討已漸趨成熟，故本論文擬對高速網路提出有效率之連結方法，因現代之高速網路均提供寬頻整合式之服務，亦即各種不同品質之服務的結合，故高速網路在經過連結後，仍應保持原來之服務品質，這使得高速網路的連結問題變得較為複雜。本篇論文將針對以下兩種最新的高速網路的連結方法進行研究；IEEE 802.6 DQDB (Distributed Queued Dual Bus)及波長分割多工網路( WDM Star Networks ) ，對於 DQDB網路，吾人先以傳統之連結方式，嘗試連結兩個DQDB網路並探討其缺點，而且提出了一個擁塞控制的方法來防止封包的遺失(Congestion Avoidance Scheme )，對於多個DQDB網路之連結，則應該提出更為有效率的方式來解決，由於DQDB網路具有何與非同步傳輸模式(Asynchronous Transfer Mode)相同之封包大小及格式，故吾人可以用一 ATM 交換機來連結多個DQDB網路，並在此架構上提出封包排程(Cell Scheduling) 、流量控制(Flow Control)等方法。對於WDM 網路，由於它是全光學式的網路，在經過連結後仍須保持全光學的特性，故吾人提出一系列之波長頻道排程方法來實現全光學式之網路連結，首先，仍以兩個 WDM 網路之連結作為起始之研究，並提出一個 時間-波長排程演算法(Time-Wavelength Scheduling Algorithm)以求得頻道配置的最佳化，然後，吾人設計了一個以多重星狀架構(Multi-Star Topology )為基礎的光交換機來解決多個WDM 網路的連結問題。In this dissertation, the high performance interconnectionof the local and metropolitan areas networks isdiscussed and studied. Two promising high speed networks,IEEE 802.6 DQDB ( Distributed Queued Dual Bus ) and WDM (Wavelength Division Multiplexing) Star Networks, are selectedas our target networks for high performanceinterconnection. Both networks, one defined in metropolitanarea (DQDB) and the other defined in local area ( WDM Star ), have the capability of providing the broadband integratedservices. We develop the interconnection schemes forthem individually. For DQDB, the disadvantages of usingtraditional routers are discussed first and then a congestionavoidance algorithm is designed to prevent the cellloss. To provide integrated services, a novelinterconnection system called the DQDB Switch is proposed. ForWDM star networks, an all-optical approach forinterconnecting two WDM star networks are proposed first.In this approach, a time-wavelength scheduling algorithm isdesigned to efficiently reuse the wavelengths. Then, anothernew approach called Multistar Photo- nic Switch forinterconnecting a scalable number of users by usingmultiple stars is studied. Since the ATM (AsynchronousTransfer Mode ) is the standard for the future broadbandintegrated services digital networks (B-ISDN), our proposalsfor the above two networks are cell-based. Theinternetworking of the proposed high performanceinterconnection systems to the ATM networks is then a veryimportant and interesting future work.